Air inlet device for internal combustion engines



July 19, 1938./ M BOETTCHER y 2,124,228

AIR INLET DEVICE FOR INTERNAL COMBUSTION ENGINES Filed March 1, 1937 ATTORNEY.

n Patented Julyl19, 1938 5 UNITED sfm.'r1 -:fsy PATENT oEFicE AIR INLET DEVICE Eon INTERNAL CoM- EUsTIoN ENGINES Magnus Boettcher, Milwaukee, Wis.v VApplintion Maron 1,v 1937, serial No. 128,375 2. claims. (01. 12s- 124ir This inventionrelates toimprovements in airshowing the windshield wiper and showing the inlet devices for. internal combustion engines. improved air inlet device connected inthe vac- Heretofore, various devices have beenfproposed uum line for the windshieldr wiper;`

for admitting additional air to theintakemani- Fig.` 2 is an enlarged longitudinal y.Seotional 5, fold of aninternal combustion engine, .whichdeview .through .a portion of the windshield ,wiper I vices are designed toprevent waste of fueland vacuum line illustrating the lnteriorv construc'f, to increase the economy and eiciency ofv operation of the air inlet device;

tion of the motor. These prior-devices have al1 Y Fig. 3 is a longitudinal sectional view` of'a been positioned .directly in the intake manifold modified form of device; and logthereby necesstating either the use ora specially Fig. 4 is a perspective view. ofthe improved V10. "constructed manifold pipe, the drilling ofk special device `showing the two parts thereof separated.` openings therein, or disconnecting-of the mani- Referring more particularly to thedraWingV,

fold from the carburetor-extension to permit inthe numeral 5' designates an intake manifold sertion of a relatively complicated air inlet depipe of an internal combustion engine, the said :,vice therebetween.v The majority of these. prior' engine being of vany standard form and includ- 15.

devices have in addition been provided with ing the Standard carburetor. .The 4intake,marlivariable air controls which do not function effold pipe 5 has ,one .end connected to thecarfectively until after the motor has attained a. blllolol and iS other end connected tothemo-N predetermined running speed. tol, and -Whhen theV motor iSv running thereis ale It is a general object of thepresent invention Ways a vacuum present-in Vthe intake manifold .20..

" to provide an improved air inlet device which. is pipe, which vacuum serves to draw the fuelmixof simple construction and which may be readilyA ture into the Cylinders:

installed by any automobile user in .a fewmin- It is common practice Vwith.present-day auto-r utes time. Y f mobiles to have a threaded opening 6 in the in- A more specific object of the present inventake manifold pipe folfi'eoiViI/lga threadediili-A tion is to provide an airy inlet device especially` ving l, Which fitting usually has ametal tubular` designed for quick connection in the vacuum line extension 3. A length' of rubber tubingV 9 has one leading to the windshield wiper motor. end slipped over the tubular extension 8 and has A further Object of the invention is ,t0 proits" other end connected to a similar extension VIII vide an air vinlet device for connection in the of the Windshield Wiper motor I I. Thesuction in "`vacuum lineleading to the Windshield wiper mothe' intake manifold iS therefore utilized; lin all 39?" tor which is so formed asnot to interfere `with modern automobiles, to operetefa Suction motor the Operation 0f the Windshield Wiper, Il.A for" Causing mOVemelll 0f thel Windshield Y A stili further object of the invention is to wiper l2 A j provide a device of the class Adescribed Lso con- Heleofole auXllIaiy ail' lrlle'G `devices haveV "-`-structed as to. increase operating economy by been formed in 01 Connected directly to the in,- 35:7-

i admitting air at au times that the motor, is take manifold. In `Some of these prior devices running Y through an opening` of constant, ef-' special holes had to be' drilled'in the intakel feqtive Size, as distinguished fyomprior devices' manifold; in others the intake manifold had toy having variableV openings 4which are effective be Specially formed; and in Still others the de- 403 only when the motor attains a predetermined vicewas insert'able between the intake manifold 'mi running speed. and the vcarburetor extension. With all these A'further specic'object'of the ,invention "is 'to prior` devices, therefore, installation was expenprovide in a device as above described; means in sive and required th Services ofi an expert. the path of the admittedairfor lproc'lucii'ig, a It is an object of the present invention to pro-V whirling` action of `said-` air to break Vthe latter Vide ,en ail vinlet4 device Which is readily insert` upvbeforegit is introduced into*thefmanifo1d,`thusl able in the tubular vacuum line leading to 'the aiding invthe vaporization of thel fuel mixture windshield wiper to form a part of saidline to,` the end that more complete combustion andy whereby additional air may be thusvadmitt'ed to maximumfuel economyare obtained. the manifold. 'Referring more particularly`v to With the above andjother objects in view, the Fig. 2, the device consists preferably of a two- ,50i invention consists ofthe improvedair inlet depart fitting comprising the parts I3 'and I4; The y vice for internal combustion -engines,*and al1 vits part I3 has a. tubular metal extension I5`projectpartsand combinations asset forth in the 4'claims ing fromone end thereof anda threaded 'porand all`'equivalentsthereof.` y y tion I6 projecting from the othei'fendthereof. In the accompanying ydrawing in' which the The fitting part`|4 has-one end internally thread-g 5g? same reference numerals fdesignatb the same ed as at I1 to receive the threaded Vextension I6J parts in all of the views; of the fitting part I3, and the tting part I4 Fig. 1 is an assembly View showing a portion has a tubular extension I8 projecting in an op- 0 of the intake manifold'in longitudinal section, posite direction from the extension IB on the fit- 60 ting part I3. When the two' fitting parts are threaded together, an internal chamber I9 is formed therein, and one of the tting parts, preferably the part I3, has a hole 2|] drilled through a side wall thereof for the purpose of admitting air from the exterior intoI the chamber I9. This hole 20 is preferably angled away from the intake manifold as illustrated. The end of the chamber I9 next to the intake manifold may also be fitted with a filtering screen 2I for the purpose of preventing the entrance of dirt or other'foreign matter into the intake manifold.

In addition, it is preferred to' employ means for breaking up Yand causing a whirling action on the air admitted through the drilled opening 20. Accordingly a batch of relatively small mesh screening 22 which has been partially crushed is inserted in the chamber I9. This screening is rather loosely crushed so that air may circulate freely therein. i

V'Io installvthe improved device, it is merely necessary to sever the rubber hose 9 at a desired point and to slip one ofthe severed ends over the fitting extension I8. and the other severed end over the fitting extension I5. Obviously this installation can be effected in a few minutes time. In those cars having a greater length of metal forming a part of the vacuum line leading to the Windshield wiper motor, one of the extensions I5 may be formed with a fitting similar to the tting 'I for insertion into the intake manifold opening 6 instead of the fitting 'I, and the-other extension I8of the air inlet device -may be provided with a socket member for the` reception of the fitting 'I Von the `end of the standard windshield `wiper vacuum line. Most automobiles have the rubber hoserunnin-g up close to the manifold as shown in Fig. 1 so that the Vtype of installation shown in Fig.V 1 is prac'- tical for the majority of cars.

. In use when the motor is running, a vacuum will-be created in the vacuum line leading toA the windshield wiper motor, and inasmuch as the chamber I9 of the air inlet device forms a part of said vacuum line, air will be sucked into the drilled opening 20, whichV air will strike the mesh of the matted screening thus agitated, whirled and broken up into a plurality of iine streams.v This breaking up'of the air will result in more perfect vaporization of the mixture and will promote more complete combustion. The air inlet hole 2D is preferably not over one-sixteenth of an inch in diameter,v

and with this small air openin-g, it is found that there is no interference with the operation of the windshield wiper motor as the opening is too small to have'any great effect upon the amount of suction existing in the windshield wiper line. By having the opening 20 angled away from the intake manifold the suction in the windshield wiper vacuum line does Vnot act in the same direction as the direction of extent of said opening, and therefore the admission of too much air or air at too high a velocity isV prevented; It is ent device air is starts running, but that said air automatically proportions -itself Vto operating conditions due to to be noted that with the presthe fact that the great-er the suction, the greater the amount of admitted air.

22 and willV bev admitted as soon as the motorv to produce a whirling action on the admitted air. In addition said spring may cooperate with a ball valve 24; whichivalve is urged to substantially sealing position by the spring when the motor is not operating. The spring, however, is so light that as soon as there is any vacuum present in the lin-e, the ball 24 will be drawn to open position, and air admitted through the air inlet 20 will be directed toward the ball 24 and then out toward the manifold, while being agitated by the convolutionsof the spring 23. The ball 24' tends to automatically produce a balanced vacuum condition on both sides thereof so that there will bea proper amount of vacuum condition for operating the windshield wiper and a proper amount for causing the admission of air through the air inlet 20. Y

Either of the forms of the invention may also be constructed with an overhanging exterior baflire 24 to prevent -grease from caking over the air inlet opening 29.

It is to be understood that the broad aspect of the present invention consists in the idea of providing an air inlet device which is of more simple construction than the usual device of this nature and which may be installed by connection directly in the vacuum line leading to the` windshieldwiper motor. Various changes andmodiiications in the exact method of installation may be devised by those skilled in the art, and all of such changes are contemplated as may come within the scope of the claims.

` What I claim is: Y

. 1. An air inlet device for internal combustion engines having a tubular vacuum line leading from vthe intake manifold to the windshield wiper motor or .other auxiliary device comprising a small tubular fitting having tubular connecting extensions projecting from opposite ends thereof and in substantial alinement with each other and with the axis of the fitting, said extensions providing for quick connection of the fitting in said vacuum line to be supportedV solely thereby from each end of the fitting, there being an air inlet opening communicating with the fitting between said alined connectingextensions, and means for agitating the admitted air.

2. An air inlet device for internal combustion engines having a tubular vacuum line leading from the intake manifold to the windshield wiper motor or other auxiliary device-comprising a small tubular fitting having tubular connecting vextensions projecting from opposite ends thereof and in substantial alinement with each other and-withthe axis of the fitting, said extensions providing for quick connection of the fitting in saidl vacuumline to be supported solely thereby from each end of the fitting, there being an air inlet opening communicating with the fitting between` said alined connecting extensions, a ball valve in said fitting, and a spring normally urging vsaid ball toward the end of the fitting away MAGN US BOETTCHER. 

